@article{SF_1994__48_3_135299,
     author = {R. Grimmer and J.H. Liu},
     title = {Integrated semigroups and integrodifferential equations.},
     journal = {Semigroup forum},
     pages = {79--95},
     year = {1994},
     volume = {48},
     number = {3},
     zbl = {0788.45011},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135299/}
}